Fireproof concrete floor construction.



J. D. HARBISON FIREPROOF CONCRETE FLOOR CONSTRUCTION.

APPLICATION PI'LBD JAN. 30, 1908.

913,820, I Patented Mar. 2, 1909.

2 SHEETS-SHEET 1.

WE NE$5 6 EQFW ATTORNEY J. D. HARRISON.

- J'osErH DUKE HARRISON,'OF BROOKLYN, NEW YO K.

. .EIREPROOE CONCRETE FLOOR CONSTRUCTION.

Specification of Letters Patent.

Patented March 2', 1909.

,Application flled January .80, 1908. Serial No. 413,841.

To all whom it may concern:

I; 'Be it known that I, JOSEPH DUKE HARRI- soN, a citizen of the UnitedStates, and a resident of Brooklyn, in the county of Kings and State ofNew York, have invented certain new and useful Improvements in FireproofConcrete Floor Constructions, of .which the following is aspecification.

v 'The' invention relates to an improved system m fire-proof concreteunit floor construction, and consists in the novel features andstructure hereinafter described, and par- I larly pointed out intheclaims.

he object of my invention is to provide an improved and highly eflicientfireproof concrete unit floor construction possessing great strength andcomposed of .parts of special character capable of being readilymanufacturedand conveniently and quickly placed in position without theuse of temporary wood or metal centerings.

In accordance with my invention the possibility of misplacedreinforcement or the improper mixing of the concrete-material is reducedto a minimum, and the uniform strength of the finished floor is assured.

The invention will be fully understood from i the detailed descriptionhereinafter presented, reference being had to the accompanying drawings,in which:

Figure l is a sectional perspective view, partly broken away and with apart of the concrete filling omitted, of a portion of a floor structureembodying my invention; Fig. 2 is as a vertical transverse section ofthe same, the filling material at one side of the I-beam being omittedand the ceiling represented; Fig. 3*is alike View of a portion of afloor structure embracing features of my invention but in which theskew-backs, unlike the system shown in Fi s. 1 and 2,'do not extendbelow to 'afford soilit protection for the I-beams; Fig; etis a verticalsection of the same on the dotted line 44 of Fig. 3; Fig. 5 is anenlarged detached transverse section through one of the unit slabsemployed in the floor construction; Fig. 6 is a pers )ective view of thesame; and Fig. 7 is an en arged vertical section through one of theskew-backs bn the dotted-line 77 ofFig. 8, which is a perspeetive viewof the same.

The novel features of the floor structure ot my invention are theskew-backs 10 and' manner shown in Figs. 1 and 2. In constructing thefloor the skew-backs 10 are applied to the usual I-b'eams 14 and theslabs 11 are so ported upon the skew-backs, the latter wit 1 the s'labsforming flat arches between the beams. The skew-backs are hollow and theslabs when in position present hollows between theiumembers, and inconstructing the floor the skew-backs and the hollows presented by theslabs are filled with a concrete mixture 15 which will extend to the toplevel of the I-beams, as denotedat the left hand side of Figs. 1, 2 and3. Upon the filling 15 are placed the usual sleepers 16 to which theboard flooring 17 may be nailed in the customary manner. Between thesleepers 1G a cheap grade of material 18 is provided to fill the spacebetween the concrete filling 15 and board flooring 17.

The skew-backs 10 will preferably cor respond in width with the slabs 11they are to support, and the preferred construction of the skew-backsand slabs is that shown in Figs. 5, (3, 7 and 8. The skew-back 10 is inthe form of a hollow integral frame open at its top and at one side andclosed at its bottom by the member 19, at its ends by the members 20 andat its outer side by the diverging members 21, 22, the member 21extending downwardly and outwardly and the member 22 downwardly andinwardly. Each skew-back will preferably be formed with a verticalpartition 23 located midway between and corresponding in outline withthe end members 20. hen the adjoining skew-backs at opposite sides ofthe beam 14 are, with their filling, intended to protect the lowerflange of said beam in the manner shown in Fig. 1, their end members 20and partitions 23 will be recessed, as at 24:, to pass upon, and meet attheir lower portions, centrally below the said flange. The skewbaeks 10are formed of reinforced concrete, the metal being indicated at 25 andpreferably being in the form of a mesh frame extending through all'themembers or parts of the skew-back.

In the end members 20 and partitions 23 ofthe skew-backs 10 I preferablyform apertures 26 to receive the lower ends of wires or hooks 27 bywhich the skew-backs may be suspended from the tops of the I-beams andthereby conveniently held in position against said beams preparatory tothe assembling of the other parts of the floor structure.

The skew-backs being hollow and openat their upper ends may beconveniently filled,

when in position,- with concrete l5, and when so filled said skew-backsformsolid seats or bearings for the ends of theslabs 11 and also solidprotection around the steel beams below their upper flanges.

Theslabs llare of elongated form' and at their ends are inclinedto-firmly seat upon the upper inclined members 21 of the skewbacks. Theslabs 11 are formed of 'reinforced concrete, the metal, indicated at 28,being in the form of a mesh of the general outline of the slab andthe-concrete being molded on the same. I preferably form each slab l1'oftwo corresponding integrally connected members 29, 30,-eachcomprising I a-top 31, downwardly diverging sides 32 and lower edgeflanges 33, as more-clearly shown in F igs.' 5 and 6, and saidmembersbeingintegrally connected at their adjoining lower edgesand also by asuitable number of transverse members or partitions 34. Be-- tween themembers 29, of. each slab is" formed a hollow or elongated chamber 35,to receive concrete filling l5, and between the adjacent sides of theslabs when the latter are assembled are created hollows or elo'ir gatedchambers, corresponding witht'he hollows 85, to receive the fillingmaterial 15-. When the slabs 11 are assembled with their ends seated onthe skew-backs.

their loweradjoining side edges and the, ad:

joining side edges of the members or parti- 35 tions 8st meet'andthereby a continuous firm floor structure of slabs 11 is formed. 'In flddition tothe reinforcing mesh 28, each "slab contains upper andlower-transverse metal rods 36 extending through the slabs and" theirpartitions 34:, and also longitudinal tension rods37 extendinglengthwise through 'the slabs at the lower ends of the sides 32' andpreferably below the lower transverse rods-36. i r The slabs 11 .are'preferably formed throughout their length withtransverse exterior ribs38 which -.when the slabs are covered over by the fillingjl5, constitutekeys which serve to thoroughly unite the filling-with the slabs. The;form oftheslabs 11, with their downwardly diverging sidesand filling 15;covering them, is of importanceinthat the floor structure is enabled tocontain a maximum am'ountof concrete to -meet the compressive stressesand a minii mum amount where tensile stresses occur.

r :The design of the slabs 1-1a lso provides for vthe use of a minimumamount ofmetalreinforcement where compressive stresses occur andamaximum amount to meet the, tensile stresses. v Since the skew-backsand slabs are of shell f Y or frame constructionthey require for theirinanufa'cture a comparatively small amount of concrete material andhencejthe'y admit being; eliminated.

of the use their formation of a. maximum strength mixture of afire-proof concrete clay or other fire resisting material. 'The filling15 will be of concrete varying in qualcomposed of cement and groundhard-burned I ity of mixture or materials in accordance I with thestrength of floor required. The

slabs and skew-backs will be of suitable size and their reinforcement ofproper character to meet the requirements, and saidslabs and skew-backsare of such form and construction that their strength when in place,without the concrete filling, is shfhcient to hold the weight thefinished floor is designed to carry. 'The skew-backs will preferably beconstructed as shown in Figs. 1, 2 and 8, so

as to afford sofiit protection for the beams -14,but may be constructed,with less advanbeams, as shown in- Figs. 3. and i.

The method of assembling the parts of the ,fioo'r structure will beunderstood without tage, to rest upon the lower flanges Ofsaid extendeddetailed explanation. The skew-' backs 10 are supported by the beams 14and the slabs 11 are seated upon the skew-backs and form fiat archesbetween the beams.

The skew-backs and the hollows presented by the slabs are filledwith-theconcrete "15,

which covers the upper surfaces of said skew-backs and slabs. TheI-beams 14 will be connected by tie-rods 40 as usual, and the fedges .ofthe skew-backs and partitions 34 of the floor-slabs will be recessed, asshown in- Fig. l, {po -accommodate theserods.

do not confine the invention in every;

instance to slabs made double or of two 1 fine the skew-backs to a widthadapting each of them'ito receive the double slab shown, but thepreferred and most eflicient and economical einbodimentof the inventionis that'presented in "Figs. 1', 2, 6 and 8.

r The advantagesofthe unit floor structure of my invention will beappreciated from the' foregoing description. I mayhowever' directattention tothejstrength and efii-' ciency of and convenience inassembling-the unit members of the structure, the fact that inthemanufacture of the skew-backs and slabs the possibility of misplacedreinfonce- -mntis reduced to aminimum, the uniform strength of thefioorstructure as a whole,

members 29,30, since said members may each] constitute an individualslab, nor do I conand the fact that no material other than that"which-constitutes a part of the finished floor comprising integralmembers each having a top, downwardly extending sides, laterallyextending lower edge flanges and transverse partition members which meetat their edges when the slabs are assembled; substantiallyas set forth.

said partition members and tension rods ex-- tendin longitudinally atthe lower ends of said sic es; substantially as set forth.

3. A floor structure comprising reinforced concrete slabs formingarches, said slabs presenting hollow frames each having a top,

downwardly extending sides and transverse partition-members which meetat their edges when the slabs are assembled, and said partition membershaving transverse rods extending through them; substantially as setforth.

4. A floor structure comprising reinforced concrete slabs formingarches, said slabs presenting hollow frames each having a top,downwardly extending sides and transverse partition members whichmeet-at their edges when the slabs are assembled, and said partitionmembers having transverse rods extending through theirupper and lowerportions; substantially as set forth.

5. A fioor structure comprising reinforced concrete slabs formingarches, said slabs presenting hollow frames each having a top,downwardly extending sides and transverse partition members which meetat their edges when the slabs are assembled, and said partition membershaving transverse rods extending through them and said frameslongitudinaltension rods at the lower ends of said sides; substantiallyas set forth.

6. A floor structure comprising reinforced concrete slabs formingarches, said slabs presenting hollow frames each having a top,downwardly diverging sides, lower edge flanges and transverse partitionmembers which meet at their end edges when the slabs are assembled, withtransverse rods extending through said partition members; sub--stantially as set forth.

7. A floor structure comprising reinforced concrete slabs formingarches, said slabs presenting. hollow frames each having a top,

downwardly diverging sides, lower edge.

flanges and transverse partition members which meet at their end edgeswhen theslabs are assembled, with transverse rods extending through saidpartition members and longitudinal tension rods at the lower ends ofsaid sides; substantially as set forth.

8. A door structure comprising skewbacks having downwardly and outwardlyinclined outer faces, and straight reinforced concrete slabs havingdownwardly and in- .wardly inclined ends conforming 'to and seated onsaid faces, said slabs forming arches and presenting hollow frameseachhaving a top, downwardly extending sides and transverse partitionmembers which meet at their 'edges when the slabs are assembled, andsaid partition members having transverse rods extending throu h them andsaid frames straight longitudinal tension rods at the lower ends of saidsides; substantially asset forth.

' Signed at New York city, in the county of New York, and State of NewYork, this 29th day of January A. D. 1908. I

- JOSEPH DUKE HARRISON.

\Vitnesses:

ARTHUR MARION,

CHAS. G. GILL.

